Safety device for power-presses.



Wl /VESSES N. SHEFF.

SAFETY DEVICE FOR POWER PRESSES.

APPLlcA-IONVHLED APR. 9, |915.

Patented Jan. 25, 1916.

EM @ci THE CQLUMBIA PLANOGRAPH C0., WASHINGTON. D. C.

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nona sHnrr, or new 'YoniL 1v. Y.

SAFETY DEVICE FOR IPO"VVER-PRlESSElS.

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Specrication of Letters Patent. l Patented Jam, 25, 19316.,

Application led April 9, 1915. Serial No. 20,179.

To all whom it may concern:

Be it known that l, N ons Srinrr, a subject of the Czar ofRussia, and aresident of the city of N ew York, borough of Brooklyn, inthe county ofKings and State of New York,have invented a new and Improved SafetyDevice for Power-Presses, of

which the following is a full, clear, and exact description.

lThe object of the invention is to provide a new and improved safetydevice for use on -foot or power' presses and similar machinery, andarranged to prevent the movable press head from descending to finalposition as long as the operators hand or hands are in position betweenthe the fixed die. Y

ln order to accomplish the desired result, use is made of a safetydevice pivotally mounted on the `press to' move up and down in front ofthe press head and the fixed press die, the said safety device beingnormally positioned at a distance above the fixed press die, acontrolling device for the movable press head, and an actuatingconnection between the said safety device and the saidcontrolling-device to normallv impart an up and down swinging motion tothe said safety device and to render the said controlling deviceinoperative on an obstruction in the downward path of the safety device.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specilicatiomin whichsimilar characters of reference indicate corresponding parts Vin all theviews. l

Figure l is aside elevation of the safety device in inactive erator toplace the work in position on the die or remove it therefrom; Fig. 2 isan enlarged sectional front elevation of the safety device with theparts in inoperative position; Fig. 3 is a similar view of the same withthe parts in position for connecting the friction clutch with the crankshaft` in case no obstruction is in the downward path of the safetydevice; and F ig. lis asectional plan view of the safety device asapplied,

rlChe foot power stamping press,illus press head andposition to allowthe op-y trated in the-drawings, is mounted on the usual frame A onwhich is fulcrumed a treadle B connected by a two-part rod C, C with aclutch mechanism D for connecting ythe driving part E of the press withthe crank shaft F used for imparting an up and down reciprocatingmovement to the press head G carrying a punch or other die H, whichoperates in conjunction with the usual fixed die l on the frame A. Thesafety device is connected with the two part rod C, C and ithconsists ofa guard J extending horizontally across the front of the press andadapted to move-up and down between the top of the fixed die l and thefront of the press head Gf. 'l1-he guard J extends from the forward endof a transversely extending lever J fulcrumed at its rear end .l2 on oneside of the frame A, and the said lever J is provided with a pivotedbutton J3 engaging a notch C2 formed in a cylindrical head C3 attachedto the upper end of the pedal part C of the two-part rod connecting thetreadle B with the clutch mechanism D.

The head C3 is mounted to slide in a bearing K attached to the frame Aand in the said head C3 is mounted to slide a head C* attached to orformed on the lower end of the rod part C'. rlfhe mo'vement of the headC* in the head C3 is limited and this movement can be adjusted by ascrew plug C5 screwing in the upper end of the head C3 and which screwplug is adapted to abut against the top plate K of the bearing K. Thedownward movement of the head C3 is limited by the bottom of the bearingK and the arrangement is such that when the rod C is moved downward onthe operator pressing the treadle B then the screw plug C5 engages thetop of the head C4 prior to the bottom of the head C3 reaching thebottom K2 of the bearing K (see Fig. 3). Thus when the treadle B ispressed and the rod C moved downward then a downward swinging movementis Vgiven to the lever J and consequently to the guard J, and during thetime the head C3 moves from the position shown .in Fig. 2 to theposition shown in F ig. 3 the head C4 and the rod C remain stationary sothat the clutch mechanism D y remains inactive. Now in case theoperators hands areY ystill at fthe die I then the guard J strikes the.'hand and in doing so prevents the operator from further pressing thetreadleA B downward to pull the rod lpart` C and the clutch D intoactive position. in

the latter and the rod parts C, C and the v.clutch D are returned to-usual normal position together with the safety device J From theforegoing it will be seen that by the arrangement described the clutchmechanism D cannot be actuated as long asy the operators hand or anyother obstruction is in the path of the Vdownwardly swinging guard J sothat the operators hand'is not liable to be injured by the descendingpunch or die held on the press rhead Vl-avingthus describedY myinvention, I

claim as new and desire to secure by Letters Patent:

l. The kcombination with a power-operated press having a movable presshead, and a controlling device for the same including members one ofwhich has alimited movement relative to the other, ofa safety devicepivotally mounted on the press to move up and down infront of the saidpress head and i'ixed press die, the: said safety device being normallypositioned at a distance above ythe press-die, and an actuatingconnection between the said safety device and lone of the members of thesaid controlling .dev-ice to normally impart an up and down swingingmotion tothe said safety device and` to render the said controllingdevice inoperative on an obstruction in the downward path of the saidsafety device.

`2. 'ln a power-operated press, the combination of av treadle,a'clutch'mechanism for vconnecting and Vdisconnecting the movable presshead relatively to the driving member of the press, a two-part rodconnecting the treadle withthe clutch mechanism, the rod parts havingheads slidable one on the other,

Y and a safety device pivoted on the said Ypress to swing up and down infront of the press, the safety device being connected with one of thesaid rod part heads.

3. in a power-operated press, the combination of a treadle, a clutchmechanism fork connecting and disconnecting the movable press headrelatively to the driving member of the press, a two-part rod connectingthe treadle with the clutch mechanism, the rod parts having heads, ofwhich one has a limited sliding movement on the other, a casing fixed onthe press and in which the head of the rod part connected with thetreadle has a limited sliding movement, and a safety guard pivoted onthe press and connected with the said head on the treadle part, the saidsafety guard extending in front of the press and being adapted to partof the rod, and the said head of the treadle part has a limited slidingmotion in the said bearing and is pivotally connected with the saidguard lever.

5. A press guard, comprising a lever pivoted on the press and having aguard arm extending horizontally across the front of the press, abearing attached to the press, and a rod connecting the treadle with theclutch of the press, the rod being made in two parts having heads, ofwhich the head of the clutch part of the rod has a limited slidablemovement in the head of the treadle part of the rod and the said head ofthe treadle part has a limited sliding motion in the said bearing and isprovided with a notch, and a button pivoted on the guard lever andengaging the said notch.

6. A press guard, comprising a lever pivloted on the press and having aguard arm extending horizontally across the front of the press, abearing attached to the press, a rod connecting the treadle with theclutch of the press, the rod being made in two parts havingk heads, ofwhich the head of the clutch part of the rod has a limited slidablemotion kin the head of the treadle part of the Vrod and the said head ofthe treadle part has a limited sliding motion in the said bearing, andmeans for regulating the slidving motion of the head of the clutch partment to move the 'same into active position, name to this specificationin the presence of the engagement of the safety device during twoSubscribing Witnesses. its downward movement with an obstructionpreventing the movement of the last NHA SHEFF mentioned member of thecontrolling device Witnesses:

into active position. JULIUs H. SEIF,

In testimony whereof I have signed my MAX SHERESIIEVSKX.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner o1 Patents, Washington, D. C.

